The following is based on the original description of Miller (1992).
The cap of Amanita walpolei is 50 - 70 mm wide, convex to broadly convex, planar in age, dry, brown, with a nonstriate margin with scanty, appendiculate volval remnants. The smooth cap is covered with small or large patches of volval remains. The flesh is white.
The gills are nearly free, close, white to cream color in age, and attached by a fine line. The short gills are present in two tiers.
The stem is 60 - 85 × 7 - 11 mm, nearly cylindric, stuffed becoming hollow in age, white, pale orange-yellow at the bulb [Ed. note: possibly volva's original color], with a mealy covering disappearing in age. The basal bulb is 25 - 35 × 19 - 27 mm, marginate to obscurely marginate, with some volval remains on top. The ring is apical, very fragile, skirt-like, white, often torn or missing in age.
The odor is not distinctive or slightly "stale."
The spores measure 9 - 11 × 6 - 6.8 µm and are ellipsoid to elongate and amyloid. Clamps are absent at bases of basidia.
This species was originally described from Walpole-Nornalup Nat. Pk., Western Australia where it is said to occur in groups under Eucalyptus jacksonii, Agonis juniperina, E. marginata, and possibly E. diversicolor and in areas dominated by E. calophylla.—R. E. Tulloss
O. K. Mill. 1992a ["1991"]. Canad. J. Bot. 69: 2697, figs. 16-19, 44.
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PERTH; isotype, VPI
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The following material is based on the protolog for this species.
from protolog: Basidiomes medium-sized.
from protolog: 50 - 70 mm wide, somewhat orangish medium brown (6E6-7), convex to broadly convex and plane in age, dry, smooth; context firm, white; margin nonstriate, scantily appendiculate; universal veil as many small ( or several large) flat somewhat orangish tan (6C4) patches.
from protolog: nearly free, attached by fine line, close, white at first, cream in age; lamellulae in at least two tiers.
from protolog: 60 - 85 × 7 - 11 mm, white to pale orange-yellow (6B3, 6C4) just at bulb, nearly cylindric, at first with farinose covering (largely disappering with age); context stuffed at first, hollow with age; bulb prominent, 25 - 35 × 19 - 27 mm, marginate to obscurely marginate; partial veil apical, very fragile, pendent, white, detersile in whole or part in age; universal veil around bulb apex.
from protolog: Odor not distinctive or "slightly stale." Taste not recorded.
from protolog: ca. 450 - 730 µm thick, "mixocutis"; filametous hyphae 2.5 - 4.2 µm wide, equal, thin-walled, "hyaline." [Note: The thickness reported for the pileipellis is quite unusual for species of sect. Validae; it is also unusual for there to be no pigment seen in the pileipellis of a species with a pileus that is distinctly pigmented to the naked eye. Absence of mention of layering is also unusual. A revision of the original material is desirable.—ed.]
from protolog: cellular; inflated cells thin-walled, hyaline, nearly isodiametric.
from protolog: 42 - 50 × 9.2 - 11 µm, 4-sterigmate; clamps not observed.
from protolog: elements hyaline; filamentous hyphae "few," (3-) 4.0 - 8.4 (-11) µm wide; inflated cells fusiform to clavate to ovoid to pyriform terminal, 30 - 80 × (7-) 13.5 - 32 µm. [Note: The author does not indicate whether the sample of the universal veil came from the pileus or the stipe base.—ed.]
lamella edge tissue
from protolog: inflated cells numerous, pyriform to broadly clavate, 21 - 41 × 10 - 18 (-26) µm, thin-walled, hyaline. [Note: This tissue misdescribed by Miller as "cheilocystidia."—ed.]
from protolog: [-/-/-] 9.0 - 11.0 × 6.0 - 6.8 μm, (Q = 1.49 - 1.68; Q' = 1.58), thin-walled, amyloid, ellipsoid to elongate; apiculus not recorded; contents not recorded; white in deposit.
from protolog: Scattered to subgregarious. "Under Eucalyptus jacksonii, Agonis juniperina Schau., [and] scattered E. marginata" with possible admixture of some E. diversicolor. Also seen in areas with plentiful E. calophylla.
from protolog: AUSTRALIA: WESTERN AUSTRALIA—Nornalup? - Walpole-Nornalup Nat. Pk., s.d. O. K. Miller 23903 (holotype, PERTH; isotype, VPI), O. K. Miller 23895 (paratype, VPI).
The editors express their thanks to Dr. Elaine Davison for her assistance with Western Australia geographical and other data relating to Miller's original materials of this taxon.
—R. E. Tulloss
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